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    <head>
      <meta charset="UTF-8">
      <meta name="viewport" content="width=device-width, initial-scale=1.0">
      <title>3、SpringAI 应用开发 - 交互式测验</title>
      <style>
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          margin: 0;
          padding: 20px;
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            width: 100%;
            max-width: 900px; /* Wider to accommodate buttons */
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .quiz-container {
          background-color: #ffffff;
          border-radius: 16px;
          box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
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          max-width: 700px;
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          z-index: 10;
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        .quiz-header {
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          color: white;
          padding: 20px 30px;
          text-align: center;
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        .quiz-header h1 {
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          font-size: 24px;
          font-weight: 700;
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        .quiz-header p {
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            font-size: 14px;
            opacity: 0.9;
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        .quiz-body {
          padding: 30px;
        }

        .progress-bar {
            display: none; /* 隐藏进度条 */
            width: 100%;
            background-color: #e0e0e0;
            border-radius: 5px;
            height: 10px;
            margin-bottom: 20px;
        }

        #progress-indicator {
            height: 100%;
            width: 0%;
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            transition: width 0.3s ease;
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          margin-bottom: 20px;
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        #question-text {
          font-size: 18px;
          font-weight: 500;
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        .options-list {
          list-style: none;
          padding: 0;
          margin: 0;
        }

        .option-item {
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          border: 1px solid #dee2e6;
          border-radius: 8px;
          padding: 15px;
          margin-bottom: 12px;
          cursor: pointer;
          transition: background-color 0.2s ease, border-color 0.2s ease;
        }

        .option-item:hover {
          background-color: #e9ecef;
        }
        
        .option-item.selected {
            background-color: #d1e7fd;
            border-color: #4a90e2;
        }

        .quiz-footer {
          padding: 20px 30px;
          display: flex;
          justify-content: space-between; /* 将按钮分布在两侧 */
          align-items: center;
          min-height: 65px; /* Reserve space */
        }

        .nav-btn {
          background-color: #4a90e2;
          color: white;
          border: none;
          border-radius: 8px;
          padding: 10px 20px;
          font-size: 16px;
          font-weight: 500;
          cursor: pointer;
          transition: background-color 0.2s ease, transform 0.2s ease;
          box-shadow: 0 4px 12px rgba(0,0,0,0.15);
        }
        
        #next-btn {
            background-color: #28a745;
        }

        .nav-btn:hover {
          background-color: #357abd;
          transform: scale(1.05);
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        .nav-btn:disabled {
            background-color: #a0c3e8;
            cursor: not-allowed;
            opacity: 0.7;
        }

        #result-container {
            border-top: 1px solid #eee;
        }
        
        .result-box {
            border-radius: 8px;
            padding: 20px;
            margin-top: 20px;
        }
        
        .result-box.correct {
            background-color: #d4edda;
            border: 1px solid #c3e6cb;
            color: #155724;
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        .result-box.incorrect {
            background-color: #f8d7da;
            border: 1px solid #f5c6cb;
            color: #721c24;
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        .result-box h3 {
            margin-top: 0;
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        .explanation-text {
            margin-top: 15px;
            line-height: 1.7;
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        .source-text {
            font-style: italic;
            font-size: 14px;
            margin-top: 15px;
            color: #555;
        }

        
        .final-score-container {
            padding: 40px;
            text-align: center;
        }
        .final-score-container h2 {
            margin-top: 0;
            margin-bottom: 30px;
        }
        .score-summary {
            display: flex;
            justify-content: center;
            gap: 20px;
            margin-bottom: 40px;
            flex-wrap: wrap;
        }
        .score-card {
            background-color: #f8f9fa;
            border-radius: 12px;
            padding: 20px;
            width: 180px;
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            border: 1px solid #e9ecef;
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        .score-card h3 {
            margin: 0 0 10px;
            font-size: 16px;
            font-weight: 500;
            color: #555;
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            font-size: 28px;
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            color: #333;
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            font-size: 16px;
        }
        .score-details td {
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        .score-details td:last-child {
            text-align: right;
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            transition: background-color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
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        .hint-container {
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            border-radius: 8px;
            padding: 15px;
            margin-top: 20px;
            color: #006064;
            font-size: 15px;
            line-height: 1.6;
            display: none; /* 默认隐藏 */
        }
      </style>
    </head>
    <body>
      <div class="main-wrapper">
          <div class="quiz-container">
            <div class="quiz-header">
              <h1>3、SpringAI 应用开发 - 交互式测验</h1>
              <p>检验你对文档内容的理解程度</p>
            </div>
            <div id="quiz-content">
                <div class="quiz-body">
                    <div class="progress-bar">
                        <div id="progress-indicator"></div>
                    </div>
                    <div id="question-container">
                      <p id="question-text"></p>
                      <ul class="options-list" id="options-list"></ul>
                    </div>
                    <div id="result-container"></div>
                    <div id="hint-container" class="hint-container"></div>
                </div>
                <div class="quiz-footer" id="quiz-footer">
                  <button id="prev-btn" class="nav-btn">上一题</button>
                  <button id="hint-btn" class="nav-btn" style="background-color: #ffc107; color: #333; box-shadow: 0 4px 12px rgba(255,193,7,0.3);">提示</button>
                  <button id="next-btn" class="nav-btn">下一题</button>
                </div>
            </div>
          </div>
      </div>

      <script>
        const quizData = [
  {
    "question": "在 `StreamingChatController` 中，为了实现AI响应的实时流式输出，主要采用了哪种技术组合？",
    "options": [
      "使用 `ResponseEntity<String>` 并手动刷新缓冲区",
      "返回一个 `CompletableFuture<String>` 对象进行异步处理",
      "使用 Project Reactor 的 `Flux<String>` 并将端点MIME类型设置为 `text/event-stream`",
      "通过 WebSocket 连接来推送消息"
    ],
    "correctAnswerIndex": 2,
    "explanation": "文档中的代码示例明确展示了 `streamResponse` 方法的返回类型是 `Flux<String>`，这是 Project Reactor 中用于处理0到N个元素序列的响应式流。同时，`@GetMapping` 注解的 `produces` 属性被设置为 `MediaType.TEXT_EVENT_STREAM_VALUE`，这表明该端点将以 Server-Sent Events (SSE) 的形式进行流式传输，从而实现了实时渐进式的用户体验。",
    "source": "文档中「1. 输出处理与优化」-「流式输出实现技术」部分",
    "hint": "请关注 `streamResponse` 方法的返回类型以及 `@GetMapping` 注解中的 `produces` 属性。"
  },
  {
    "question": "根据 `StructuredDataService` 的实现，为了让大语言模型能够返回特定格式的JSON，最关键的步骤是什么？",
    "options": [
      "在调用 `chatClient` 后，使用正则表达式强行从文本中提取JSON",
      "使用一个特殊的 `JsonParsingChatClient` 替代默认的 `ChatClient`",
      "将目标Java类的 `Class` 对象作为参数直接传入 `chatClient.call` 方法",
      "在提示（Prompt）中加入一个 `SystemMessage`，明确指示模型按指定Java类的结构生成JSON"
    ],
    "correctAnswerIndex": 3,
    "explanation": "该服务的核心技巧在于“提示工程”（Prompt Engineering）。代码通过创建一个 `SystemMessage`，其中包含明确的指令：“你必须以有效的JSON格式返回数据，格式需完全匹配以下类: ...”，来引导和约束模型的输出行为。虽然代码后续也使用了正则表达式来提取JSON，但这只是辅助步骤，真正的关键在于前期的指令。",
    "source": "文档中「1. 输出处理与优化」-「结构化数据提取方法」部分",
    "hint": "思考一下，在调用AI之前，代码是如何“告诉”AI它期望的输出格式的？"
  },
  {
    "question": "在 `ResilientAiService` 中，当服务遇到“请求过于频繁”（TOO_MANY_REQUESTS）的错误时，采取了哪种具体的重试策略？",
    "options": [
      "固定延迟重试，每次都等待相同的时间",
      "指数退避（Exponential Backoff），即随着重试次数增加，等待时间呈指数级增长",
      "立即重试，不设置任何等待时间",
      "放弃重试，并立即向上层抛出异常"
    ],
    "correctAnswerIndex": 1,
    "explanation": "代码段 `Thread.sleep(1000 * (long)Math.pow(2, attempts))` 清晰地展示了指数退避策略的实现。等待时间是根据重试次数 `attempts` 的指数（`2`的`attempts`次方）来计算的。这种策略可以有效缓解对被调用服务的压力，避免因连续快速重试而导致服务持续过载。",
    "source": "文档中「1. 输出处理与优化」-「错误处理与恢复策略」部分",
    "hint": "代码中计算休眠时间的方式 `Math.pow(2, attempts)` 是哪种经典重试算法的特征？"
  },
  {
    "question": "在 `CustomerSupportService` 的实现中，构建增强提示（RAG模式）的第一步是什么？",
    "options": [
      "将用户的当前问题直接发送给 `ChatClient`",
      "更新用户的对话历史记录",
      "从向量存储（VectorStore）中进行相似性搜索以检索相关文档",
      "构建一个 `SystemMessage` 来定义AI助手的角色"
    ],
    "correctAnswerIndex": 2,
    "explanation": "该服务遵循了典型的检索增强生成（RAG）模式。在 `handleCustomerQuery` 方法中，代码执行的第一个操作就是 `knowledgeBase.similaritySearch(query, 3)`。这一步从知识库（向量存储）中检索与用户问题最相关的文档，然后将这些检索到的信息作为上下文注入到后续的提示中，从而让AI的回答更具事实性和准确性。",
    "source": "文档中「2. 智能客服与知识库系统」-「智能客服系统架构与实现」部分",
    "hint": "在代码的注释中，哪一步被标记为“1. 从知识库检索相关信息”？"
  },
  {
    "question": "`OptimizedAiService` 是如何实现模型调用优化的？",
    "options": [
      "为所有任务随机选择一个模型以实现负载均衡",
      "它总是使用性能最强的模型（如'gpt-4'）来保证回答质量",
      "根据任务的复杂度（SIMPLE, MEDIUM, COMPLEX）来选择不同的AI模型和配置",
      "通过缓存机制，对相同的查询直接返回结果而不调用模型"
    ],
    "correctAnswerIndex": 2,
    "explanation": "该服务通过一个 `switch` 语句，根据传入的 `TaskComplexity` 枚举值来动态选择 `ChatClient`。对于简单任务，它会选择更快速、成本更低的模型（如 'gpt-3.5'），而对于复杂任务，则会选择能力更强的模型（如 'gpt-4'）。这种策略旨在平衡成本、响应速度和输出质量。",
    "source": "文档中「4. 性能与质量保障」-「模型调用优化方法」部分",
    "hint": "观察 `getOptimizedResponse` 方法中的 `switch (complexity)` 代码块，它是如何根据 `complexity` 做出不同决策的？"
  },
  {
    "question": "根据 `SecureAiService` 的代码，在将用户输入发送给AI模型之前，采取了什么措施来保护用户隐私？",
    "options": [
      "对整个输入字符串进行AES加密",
      "检查并脱敏（Sanitize）输入内容中的个人身份信息（PII）",
      "要求用户同意隐私条款后才能提交",
      "将数据发送到在本地部署的安全AI模型"
    ],
    "correctAnswerIndex": 1,
    "explanation": "该服务在调用 `chatClient` 之前，会先执行 `detectAndSanitizePii` 方法。这个方法使用正则表达式来查找并替换电子邮件、电话号码、身份证号等个人身份信息（PII），将其替换为 `[EMAIL]`、`[PHONE]` 等占位符。这是一种重要的数据脱敏技术，可以在与第三方服务交互时保护用户隐私。",
    "source": "文档中「4. 性能与质量保障」-「安全与隐私保护措施」部分",
    "hint": "在 `processSensitiveContent` 方法中，调用 `chatClient.call` 之前，`userInput` 变量经过了哪个方法的处理？"
  },
  {
    "question": "`AiCostMonitorService` 是如何实现对AI调用成本进行控制的？",
    "options": [
      "在API调用后，检查返回的成本，如果超支则记录日志",
      "根据最大成本限制，预先计算并设置本次调用允许生成的最大令牌数（maxTokens）",
      "如果预估成本过高，则自动切换到一个更便宜的AI模型",
      "只允许拥有特定权限的用户进行高成本的调用"
    ],
    "correctAnswerIndex": 1,
    "explanation": "该服务通过 `calculateMaxTokens` 方法，根据用户设定的最大成本（`maxCost`）和提示的令牌数，反向计算出本次调用最多可以生成多少令牌。然后，它将这个计算出的 `maxResponseTokens` 值设置到 `ChatOptions` 中，从而在API调用层面就限制了输出的长度，达到了主动控制成本的目的。",
    "source": "文档中「4. 性能与质量保障」-「成本监控与控制方法」部分",
    "hint": "在调用AI之前，`maxCost` 这个参数是如何影响 `ChatOptions` 的配置的？"
  }
];
        console.log("Quiz Data:", JSON.parse(JSON.stringify(quizData))); // 添加这行用于调试，以可展开的JSON格式输出
        
        let currentQuestionIndex = 0;
        let score = 0;
        // 存储每个问题的回答状态
        const userAnswers = new Array(quizData.length).fill(null); 

        const questionTextEl = document.getElementById('question-text');
        const optionsListEl = document.getElementById('options-list');
        const resultContainerEl = document.getElementById('result-container');
        const quizContentEl = document.getElementById('quiz-content');
        const progressIndicatorEl = document.getElementById('progress-indicator');
        const prevBtn = document.getElementById('prev-btn');
        const nextBtn = document.getElementById('next-btn');
        const hintBtn = document.getElementById('hint-btn');
        const hintContainerEl = document.getElementById('hint-container');

        function loadQuestion() {
          resultContainerEl.innerHTML = '';
          optionsListEl.innerHTML = '';
          hintContainerEl.style.display = 'none'; // 隐藏提示
          
          if (currentQuestionIndex >= quizData.length) {
            showFinalScore();
            return;
          }

          updateProgress();

          const currentQuestion = quizData[currentQuestionIndex];
          questionTextEl.textContent = `(${currentQuestionIndex + 1}/${quizData.length}) ${currentQuestion.question}`;
          
          currentQuestion.options.forEach((optionText, index) => {
            const li = document.createElement('li');
            li.className = 'option-item';
            li.textContent = optionText;
            li.dataset.index = index; // Store index in a data attribute
            // 如果这道题已经回答过，恢复状态
            if (userAnswers[currentQuestionIndex] !== null) {
                if (index === userAnswers[currentQuestionIndex]) {
                    li.classList.add('selected');
                }
            }
            optionsListEl.appendChild(li);
          });

          // 如果已经回答过，直接显示结果
          if (userAnswers[currentQuestionIndex] !== null) {
              const isCorrect = userAnswers[currentQuestionIndex] === currentQuestion.correctAnswerIndex;
              showResult(isCorrect, currentQuestion);
          }
          
          updateNavigationButtons();
          updateProgress();
        }

        function selectOption(optionIndex) {
            userAnswers[currentQuestionIndex] = optionIndex;
            const currentQuestion = quizData[currentQuestionIndex];
            const isCorrect = optionIndex === currentQuestion.correctAnswerIndex;

            // 重新计算分数
            score = userAnswers.reduce((acc, answer, index) => {
                return answer === quizData[index].correctAnswerIndex ? acc + 1 : acc;
            }, 0);

            showResult(isCorrect, currentQuestion);
            updateNavigationButtons();
        }
        
        function updateProgress() {
            const answeredQuestions = userAnswers.filter(answer => answer !== null).length;
            const progressPercentage = (answeredQuestions / quizData.length) * 100;
            progressIndicatorEl.style.width = `${progressPercentage}%`;
        }
        
        function updateNavigationButtons() {
            prevBtn.style.display = 'block';
            nextBtn.style.display = 'block';
            hintBtn.style.display = 'block'; // 显示提示按钮

            prevBtn.disabled = currentQuestionIndex === 0;
            nextBtn.disabled = false; // 最后一题时，下一题按钮不禁用，而是用于显示报告
            nextBtn.textContent = (currentQuestionIndex === quizData.length - 1) ? '查看报告' : '下一题';
            
            // 如果当前问题没有提示，则禁用提示按钮并隐藏提示内容
            if (!quizData[currentQuestionIndex].hint) {
                hintBtn.disabled = true;
                hintContainerEl.style.display = 'none';
                hintContainerEl.textContent = ''; // 清除旧的提示内容
            } else {
                hintBtn.disabled = false;
            }
        }

        function showResult(isCorrect, questionData) {
            resultContainerEl.innerHTML = ''; // 清空之前的结果
            const resultBox = document.createElement('div');
            resultBox.className = `result-box ${isCorrect ? 'correct' : 'incorrect'}`;
            
            let html = `<h3>${isCorrect ? '回答正确！' : '回答错误'}</h3>`;
            if (!isCorrect) {
                html += `<p><strong>正确答案是：</strong> ${questionData.options[questionData.correctAnswerIndex]}</p>`;
            }
            html += `<div class="explanation-text">${questionData.explanation}</div>`;
            html += `<div class="source-text">来源: ${questionData.source}</div>`;
            
            resultBox.innerHTML = html;
            resultContainerEl.appendChild(resultBox);

            // 禁用所有选项的点击事件，并高亮正确/错误答案
            Array.from(optionsListEl.children).forEach((child, index) => {
                child.style.pointerEvents = 'none';
                // 高亮正确答案
                if (index === questionData.correctAnswerIndex) {
                    child.classList.add('correct'); // 需要添加CSS样式
                    child.style.backgroundColor = '#d4edda';
                    child.style.borderColor = '#c3e6cb';
                }
                // 如果选错了，高亮错误选项
                if (!isCorrect && index === userAnswers[currentQuestionIndex]) {
                    child.classList.add('incorrect'); // 需要添加CSS样式
                    child.style.backgroundColor = '#f8d7da';
                    child.style.borderColor = '#f5c6cb';
                }
            });
        }

        function goToNextQuestion() {
            if (currentQuestionIndex < quizData.length - 1) {
                currentQuestionIndex++;
                loadQuestion();
            } else {
                showFinalScore();
            }
        }

        function goToPreviousQuestion() {
            if (currentQuestionIndex > 0) {
                currentQuestionIndex--;
                loadQuestion();
            }
        }
        
        function showHint() {
            const currentQuestion = quizData[currentQuestionIndex];
            if (currentQuestion.hint) {
                hintContainerEl.textContent = currentQuestion.hint;
                hintContainerEl.style.display = 'block';
            } else {
                hintContainerEl.style.display = 'none';
            }
        }

        function showFinalScore() {
            document.querySelector('.quiz-body').style.display = 'none';
            document.getElementById('quiz-footer').style.display = 'none';

            const correctCount = score;
            const totalQuestions = quizData.length;
            const answeredCount = userAnswers.filter(a => a !== null).length;
            const wrongCount = answeredCount - correctCount;
            const skippedCount = totalQuestions - answeredCount;
            const accuracy = totalQuestions > 0 ? Math.round((correctCount / totalQuestions) * 100) : 0;
            const errorRate = totalQuestions > 0 ? Math.round((wrongCount / totalQuestions) * 100) : 0;

            const finalScoreHtml =
                '<div class="final-score-container">' +
                '<h2>答题报告</h2>' +
                '<div class="score-summary">' +
                '<div class="score-card">' +
                '<h3>得分</h3>' +
                '<p>' + correctCount + ' / ' + totalQuestions + '</p>' +
                '</div>' +
                '<div class="score-card">' +
                '<h3>正确率</h3>' +
                '<p>' + accuracy + '%</p>' +
                '</div>' +
                '<div class="score-card">' +
                '<h3>错误率</h3>' +
                '<p>' + errorRate + '%</p>' +
                '</div>' +
                '<div class="score-card score-details">' +
                '<table>' +
                '<tr><td>正确</td><td>' + correctCount + '</td></tr>' +
                '<tr><td>错误</td><td>' + wrongCount + '</td></tr>' +
                '<tr><td>未答</td><td>' + skippedCount + '</td></tr>' +
                '</table>' +
                '</div>' +
                '</div>' +
                '<div class="report-actions">' +
                '<button id="review-btn">回顾测验</button>' +
                '<button class="primary" onclick="location.reload()">再试一次</button>' +
                '</div>' +
                '</div>';

            let reportEl = document.querySelector('.final-score-container');
            if (reportEl) {
                reportEl.remove();
            }
            quizContentEl.insertAdjacentHTML('beforeend', finalScoreHtml);
            document.getElementById('review-btn').addEventListener('click', reviewQuiz);
        }

        function reviewQuiz() {
            const reportEl = document.querySelector('.final-score-container');
            if (reportEl) {
                reportEl.remove();
            }

            document.querySelector('.quiz-body').style.display = 'block';
            document.getElementById('quiz-footer').style.display = 'flex';
            
            currentQuestionIndex = 0;
            loadQuestion();
            updateNavigationButtons(); // Ensure nav buttons are correctly displayed
        }

        // Event Delegation for options
        optionsListEl.addEventListener('click', (event) => {
            if (event.target && event.target.matches('li.option-item')) {
                // Check if the question has already been answered
                if (userAnswers[currentQuestionIndex] === null) {
                    const selectedIndex = parseInt(event.target.dataset.index, 10);
                    selectOption(selectedIndex);
                }
            }
        });

        prevBtn.addEventListener('click', goToPreviousQuestion);
        nextBtn.addEventListener('click', goToNextQuestion);
        hintBtn.addEventListener('click', showHint);
        
        // 初始加载
        loadQuestion();
      </script>
    </body>
    </html>
  